I ordered this for a Johnson 3.5hp 2-stroke. It does NOT fit on this motor due to the small cavitation plate. I did get it to work with the help of an Engineer friend who custom made a clamp plate for under the cavitation plate.

Description:
The Sting Ray XRIII is designed with a
new sleeker hydrodynamic profile for the fastest hole shot yet. This unique design mirrors the tunnel-prop technology of offshore superboats. By capturing the prop wash, the XRIII harnesses its power for added ...